Turbine ring assembly

Abstract

A turbine ring assembly includes ring sectors forming a turbine ring and a ring support structure, each ring sector having, in a section plane defined by an axial direction and a radial direction of the turbine ring, a portion forming an annular base with, in the radial direction, an inside face defining the inside face of the turbine ring and an outside face from which a first and a second attachment tab protrude, the ring support structure having a central annulus from which a first and a second radial tab protrude, between which the first and second attachment tabs of each ring sector are held. The first radial tab comprises a one-piece annular flange that is fastened in a removable manner to the central annulus of the ring support structure.

The invention claimed is: 
     
       1. A turbine ring assembly comprising a ring support structure and a plurality of ring sectors, wherein the plurality of ring sectors form a turbine ring, each ring sector having, in a section plane defined by an axial direction and a radial direction of the turbine ring, a portion forming an annular base with, in the radial direction of the turbine ring, an inside face defining an internal face of the turbine ring and an outside face from which a first and a second attachment tab protrude, the ring support structure having a central annulus and a one-piece annular flange, wherein a first radial tab protrudes from the one-piece annular flange and a second radial tab protrudes from the central annulus, wherein the first and second attachment tabs of each ring sector are held between the first radial tab protruding from the one-piece annular flange and the second radial tab protruding from the central annulus,
 wherein the one-piece annular flange is fastened in a removable manner to the central annulus of the ring support structure, the annular flange having a first end that is free, a second end coupled to the central annulus of the ring support structure, and a plurality of attachment hooks that protrude from the second end of the annular flange and engage with at least one compartment included in the central annulus of the ring support structure in order to hold the annular flange in position, the annular flange comprising a first and a second attachment hook that each protrude from the second end of the annular flange in the axial direction of the turbine ring, the first and second attachment hooks being spaced apart in the radial direction of the turbine ring, the central annulus of the ring support structure comprising two attachment compartments that engage with the first and second attachment hooks of the annular flange in order to hold the annular flange in position in the radial direction of the turbine ring. 
 
     
     
       2. The assembly as claimed in  claim 1 , in which the annular flange comprises a first portion that extends from the first end and a second portion that extends between the first portion and the second end, the first portion comprising separate first and second tabs, the first tab of the first and second tabs bearing against the first attachment tab and the second tab of the first and second tabs being spaced apart from the first tab of the first and second tabs in the axial direction, the second tab of the first and second tabs being upstream of the first tab with respect to the direction of an air flow intended to pass through the turbine ring assembly. 
     
     
       3. The assembly as claimed in  claim 1 , in which the first and second attachment hooks of the annular flange have two different axial positions in the axial direction of the turbine ring. 
     
     
       4. The assembly as claimed in  claim 1 , comprising, for each ring sector, at least three pegs for holding the ring sector radially in position, the first and second attachment tabs of each ring sector each comprising a first end integral with the outside face of the annular base, a free second end, at least three lugs for receiving said at least three pegs, at least two lugs of said at least three lugs protruding from the second end of one of the first or second attachment tabs in the radial direction of the turbine ring, and at least one lug of said at least three lugs protruding from the second end of the other attachment tab in the radial direction of the turbine ring, each receiving lug having an orifice for receiving one of the pegs. 
     
     
       5. The assembly as claimed in  claim 4 , in which a second portion of the annular flange has orifices for receiving one of the pegs, and the second attachment tab comprises an annular bracket having a first portion bearing against the second attachment tab, a second portion that is thinner than the first portion, and a third portion that is positioned between the first and the second portion and has one or more orifices for receiving one of the pegs. 
     
     
       6. The assembly as claimed in  claim 1 , in which each ring sector comprises rectilinear bearing surfaces on faces of the first and second attachment tabs in contact with the second radial tab and the annular flange, respectively. 
     
     
       7. The assembly as claimed in  claim 1 , in which, for each ring sector, faces of the second radial tab and of the annular flange in contact with the first and second attachment tabs, respectively, comprise rectilinear bearing surfaces. 
     
     
       8. The assembly as claimed in  claim 6 , in which each rectilinear bearing surface comprises a recessed groove along an entire length of the bearing surface and a seal fitted in the groove for improving sealing. 
     
     
       9. A turbomachine comprising a turbine ring assembly comprising a ring support structure and a plurality of ring sectors, wherein the plurality of ring sectors form a turbine ring, each ring sector having, in a section plane defined by an axial direction and a radial direction of the turbine ring, a portion forming an annular base with, in the radial direction of the turbine ring, an inside face defining an inside face of the turbine ring and an outside face from which a first and a second attachment tab protrude, the ring support structure having a central annulus and a one-piece annular flange, wherein a first radial tab protrudes from the one-piece annular flange and a second radial tab protrudes from the central annulus, wherein the first and second attachment tabs of each ring sector are held between the first radial tab protruding from the one-piece annular flange and the second radial tab protruding from the central annulus,
 wherein the one-piece annular flange is fastened in a removable manner to the central annulus of the ring support structure, the annular flange having a free first end, a second end coupled to the central annulus of the ring support structure, and a plurality of attachment hooks that protrude from the second end of the annular flange and engage with at least one compartment included in the central annulus of the ring support structure in order to hold the annular flange in position, the annular flange comprising a first and a second attachment hook that each protrude from the second end of the annular flange in the axial direction of the turbine ring, the first and second attachment hooks being spaced apart in the radial direction of the turbine ring, the central annulus of the ring support structure comprising two attachment compartments that engage with the first and second attachment hooks of the annular flange in order to hold the annular flange in position in the radial direction of the turbine ring.